1/17/2013 - 325th Security Forces Squadron Airmen enter the fitness center as part of a response to a call about shots fired during a base exercise. The exercise is designed to provide an opportunity to validate training effectiveness and make changes where needed with minimal risk to personnel and property. Tyndall generally executes up to four exercises per year and scenarios vary. (U.S. Air Force photo by Lisa Norman)

1/17/2013 - 325th Security Forces Squadron Airmen carry a "victim" of an active shooter in the base fitness center as part of a base exercise. The exercise is designed to provide an opportunity to validate training effectiveness and make changes where needed with minimal risk to personnel and property. Tyndall generally executes up to four exercises per year and scenarios vary. (U.S. Air Force photo by Lisa Norman)

1/17/2013 - 325th Medical Group Airmen listen to instructions as they provide medical care to a "victim" of an active shooter in the base fitness center as part of a base exercise. The exercise is designed to provide an opportunity to validate training effectiveness and make changes where needed with minimal risk to personnel and property. Tyndall generally executes up to four exercises per year and scenarios vary. (U.S. Air Force photo by Lisa Norman)

1/17/2013 - 325th Medical Group Airmen provide medical care to a "victim" of an active shooter in the base fitness center as part of a base exercise. The exercise is designed to provide an opportunity to validate training effectiveness and make changes where needed with minimal risk to personnel and property. Tyndall generally executes up to four exercises per year and scenarios vary. (U.S. Air Force photo by Lisa Norman)